TM 55-4920-432-13&P
3-10 DRAINING THE OIL SUMPS
3-10
The filters in the system are equipped with oil sumps which permit only air to enter the vacuum and pressure
lines to the instruments. Once the oil collects to a level occupying more than 50 percent of the total glass area
of the sumps, the sumps must be drained. To drain the sumps proceed as follows:
a.
Loosen the fasteners on the control panel to gain access to
the interior. (2 places).
b.
Loosen sump bowl from sump mounting body and remove it from chassis to empty oil.
c.
Clean bowl and filter with a lint free cloth dampened in alcohol (D7).
d.
Secure bowl tightly into sump mounting body to prevent leakage.
e.
Operate test set for maximum pressure as well as vacuum settings to insure no system's leaks exist.
3-6
